Broiler heats up even with all turned off

SOURCE: stove and oven not heating---display works. no error codes

faulty element

SOURCE: GE OVEN DOES NOT WORK PROPERLY JBP69SGH2SS

I am not an expert, but this has happened to me. Examine your circuit breaker and see that it provides the amps that your oven requires. If it just barely provides it, then it could be that your circuit breaker is tripping if you have anything else on that line and it is being used. Especially hair dryers. If your circuit breaker is not tripping, you should contact GE or repair service because you may have a "power module" problem. Good luck.

SOURCE: Oven goes into Hyper Hot Immediateley?

It's either a problem in the board or one of the elements is shorted to ground.  Most likely one of the relays on the board is bad so the board would have to be replaced.  If you have a multimeter you can check this.  Unplug the range and take the back panel off to get to the elements.  Take one wire off of each of the elements. Set meter to ohms to check resistance.  Put one meter lead on one end of the element (where you disconnected the wire) and the other lead to ground.  If that shows resistance then the element is shorted to ground.  Do this with both elements.  If neither element is grounded then replace the oven control board.

SOURCE: GE Spectra range

All of the items you mention that do work, are 120 volt items.
All the items that do NOT work are 220 volt items.
Sounds like you have a voltage problem, you will need to use a meter to check if you have 220 volts a/c to the outlet the stove plugs into. Take care when doing the following, you will be around live voltage and could get hurt. If you are uncomfortable working with a live circuit best to call someone in to do it for you. Check for 220v at the outlet for the stove (where the stove plugs into), if you have it there, go to where the cord attaches to the stove and check at that point. You should have either a 3 or 4 wire cord on the stove, On the rear of the stove there is a terminal block that the cord is fastened to. Between RED and BLACK you should have 220v, between RED and WHITE and BLACK and WHITE you should see 120v. Another thing to check is that the nuts holding the wires from the cord to the terminal block on the stove are turned down tight. A loose connection there will give you the same problem you have as well.

SOURCE: Display goes blank, no heat, no oven

This I hope will be an easy solution for you. I think you have a circuit breaker tripped or a fuse if you have a fuse panel.. I am guessing you have an old fuse panel. When you have a fuse blown on a 230 volt appliance and you turn a swith on (like your knob) it feeds back to other circuits on the 120 circuits and will make it do crazzzy things, like making lights and clocks work..Regardless if you have fuse or breaker you dont have the 240 volt to run the range..You only have one120 volt leg powering your stove.